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Title:
LOW-IRON-LOSS GRAIN-ORIENTED ELECTRICAL STEEL SHEET AND PRODUCTION METHOD FOR SAME
Document Type and Number:
WIPO Patent Application WO/2019/131853
Kind Code:
A1
Abstract:
According to the present invention, when a grain-oriented electrical steel sheet is produced by hot rolling, hot-rolled-sheet annealing, cold rolling, primary recrystallization annealing/decarburization annealing, and finish annealing a steel slab that contains, by mass%, 0.02%– 0.10% of C, 2.0%–5.0% of Si, and 0.01%–0.30% of Mn and also contains an inhibitor-forming component: the value of the ratio (sol. Al/N) of the sol. Al and N content of the steel slab and the final sheet thickness d have a prescribed relationship; the finish annealing includes a purification process that involves a heating process that includes soaking for 5–200 hr at above 850°C but not above 950°C, heating between 950°C and 1,050 °C at 5°C–30°C/hr, and holding for at least 2 hr at 1,100°C or higher; and, as a result of secondary recrystallization structures that have an average circle equivalent diameter of 10–100 mm, an average aspect ratio of less than 2.0, and an aspect ratio standard deviation of no more than 1.0 being formed, a grain-oriented electrical steel sheet that, even at an extremely thin sheet thickness, has favorable magnetic properties and little variation over the entire length of a coil is obtained.

Inventors:
TAKENAKA MASANORI (JP)
WATANABE MAKOTO (JP)
EHASHI YUIKO (JP)
Application Number:
PCT/JP2018/048084
Publication Date:
July 04, 2019
Filing Date:
December 27, 2018
Export Citation:
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Assignee:
JFE STEEL CORP (JP)
International Classes:
C22C38/00; C21D8/12; C22C38/04; C22C38/60; H01F1/147
Domestic Patent References:
WO2011115120A12011-09-22
WO2010110217A12010-09-30
Foreign References:
JPH08288115A1996-11-01
JPH09143637A1997-06-03
JP2006274405A2006-10-12
JP2014062305A2014-04-10
US20130174940A12013-07-11
JPS4015644B
JPS5113469B21976-04-28
JPH0717956B21995-03-01
JPH0625747A1994-02-01
JPH0742507B21995-05-10
JPH04341518A1992-11-27
JP2013047382A2013-03-07
Other References:
See also references of EP 3733895A4
Attorney, Agent or Firm:
GINZA MARONIE P.C. (JP)
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